Four the week
Better late than never? Herbicide spray windows are closing but some fields still have major weed issues. Does the yield risk from herbicide damage outweigh the yield benefit from zapping that weed competition?
Plane truth. You have to knock back those weeds, and now. Sometimes that means hiring a plane when field conditions are just too soggy for your ground sprayer.
Weevil nets. Wait until 20% flowering to spray cabbage seedpod weevil, and only spray if thresholds are reached. Got your sweep net ready?
Sclerotia depots. AAFC in Saskatchewan has 67 depots across the province to monitor apothecia emergence. These depots will assist growers with their sclerotinia stem rot risk assessment.
Map of the week
This map from Agriculture and Agri-Food Canada shows the regions where growing degree days (Base 7°C) have reached sufficient levels to trigger emergence of bertha armyworm adults from pupae. Adults will start emerging in orange areas.
As adults emerge, they will start showing up in traps all across the Prairies. Keep tabs on cumulative adult counts over the next weeks as an indicator of potential risk in your area. Egg laying takes place shortly after adult emergence, and then it takes about 4-6 weeks for the larvae to mature to the most damaging instars.
June 25 Quiz
The leaf on the right is short a key nutrient. What is it? The quiz this week is about identifying and treating nutrient deficiencies.
Source: Alberta Canola Producers Commission